Lime and limestone are essential components in glassmaking. When lime is heated with silica sand (SiO2) and sodium carbonate (Na2CO3), a solution is formed that does not crystallize when cooled. Instead, it hardens to an amorphous, clear and nearly colourless solid - namely, glass. A range of chemical limestone and lime product types are available for general applications and achieving various properties such as; flux capture, managing viscosity, improving durability and chemical resistance.
Lime in glass – a vital component
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There are three distinct types of limestone, defined by their magnesium carbonate (MgCO3) concentrations. These types are Dolomitic (35 to 46% MgCO3), Magnesian (5 to 35% MgCO3) and High calcium (less than 5% MgCO3).